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I know it's not something common, but I was seeing a very big file being backed up and I didn't want to wait for the full transfer to finish, the backup was started a while ago so I didn't want to restart to include a new exclude, I entered python in gdb and closed the file handle, to my surprise, instead of just skipping the file, Python gave a nice backtrace (and finally I added an exclude.)
I guess a try/except should be added for IOErrors around those lines even if it's not something common so rdiff-backup can handle such case.